Fuel-injection device.



F. MULLER.

FUEL INJECTION DEVICE.

APPLICATION FILED AUG. 6, 1913.

Patented Nov. 24, 1914.

Irn/i'ntor-z His ttorney.

FRANZ MITLLER, OF CHARLOTTI'INBURG. GERMANY, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A

CORPORATION OF NEW YORK.

FUEL-INJECTION DEVICE.

Specification of Letters Patent.

Patented Nov. 24, 1914.

Application filed August 5, 1913. Serial No. 783,035.

To all whom it may concern Be it known that I, FnAxz MiiLLuu, a subject of the King of Saxony, residing at Charlottenburg, Germany. have invented certain new and useful Improvements in Fuel-Injection Devices, of which the following is a specification.

This invention relates to internal combustion engines, of the type in which liquid fuel is injected by air pressure into the Workin cylinder where it is ignited by the heat of a highly-compressed charge of air.

The object of the invention is to provide an improved inlet valve for the liquid fuel; which is simple in construction and will prevent any backward flow of air into the delivery pipe of the pump. This insures a uniform delivery of fuel by the pump and prevents fluctuation in the operation of the engine.

The accompanying drawing represents in section an inlet valve embodying my invention.

A portion of the engine cylinder 1 is shown, together with a part of the piston 2. The valve is conveniently located in the cylinder head 3, being mounted in a column 4 which crosses the water jacketing space in said head. Said column is counter-bored to receive the tubular valve casing 5 which is held in place by a screw-threaded gland 6. At the lower end of the casing is a conical seat 7 below which is a small orifice 8 opening into the combustion space of the cylinder I. In the wall of the casing is a tortuous passage 9 communicating at various points by ducts 10 with the interior of the casing just above the conical seat. A passage 11 in the column 4 connects with the passage 9, and serves to conduct thereto a supply of fluid under pressure, preferably compressed air.

A tubular valve 12 fits the interior of the casing, having a solid conical tip to fit the seat 7. A tube 13 nearly fills the interior of the valve, being closed by a screw plug 14 at its upper end, and provided with a down- Wardly-openiug spring-seated check valve 15 at its lower end. Below the check valve is a small chamber in the valve 12, from which ports 16 lead through the walls of the valve, and register with the inner ends of the ducts 10. when said valve is closed upon its seat.

The. valve. 13 can be lifted by a lever 17 engaging with a collar 18. Above said collar is a con'iprcssion spring 19 which seats the valve and holds it closed until the lever is actuated.

A flexible pipe 20 communicates with the interior of the tube 13, and conveys thereto liquid fuel from the force pump 2]. which has a check valve 22 on its delivery side to prevent any back flow of the fuel.

The operation is as follows: At each stroke of the pump, a given quantity of fuel is forced past the two check valves 22 and 15 into the chamber at the lower end of the valve 12 and thence through the ports 16 and ducts 10 into the passage 9. The next instant the valve 12 is lifted oil its seat, and

the air pressure in the passage 11 blows the charge of fuel from the passage 9 back through the ducts 10 and down through the orifice 8 into the cylinder. The air is effectually prevented by the check valve 15 from entering the tube 13, so that there can be no alteration in the amount of fuel delivered at each stroke of the pump.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus Which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

lVhat I claim as new and desire to secure by Letters Patent of the United States, is,

1. An inlet valve for an internal combustion engine comprising a casing having a valve seat, a tubular valve having a solid tip which engages the seat, said valve being provided with ports above the tip through which fuel is conveyed to the region around the valve seat, and a downwardly opening check valve above said ports.

2. An inlet valve for a high pressure internal combustion engine, comprising a casing having a valve seat, a tubular valve for the seat having ports in its lower end through which fuel is conveyed to a region adjacent the valve seat, means for conveying air pressure to the valve seat, and a downwardly-opening check-valve in said tubular valve in advance of said ports.

3. An inlet valve for a high pressure internal combustion engine, comprising a valve basing having a conical seat, a tortuous passage in its wall and ducts leading from said passage to said seat, a tubular valve havim a solid conical tip and ports just above it which communicate with said ducts, and a downwardly-opening checkvalve in said tubular valve just above said ports.

4:. The combination with an internal combustion engine having a passage through its cylinder wall, of a tubular valve for closing said passage, said valve having ports in its lower end, a check valve arranged within the tubular valve above said ports, means for forcing fuel through said tubular valve, past the check valve, and out through said ports, and means for conveying air pressure to blow thefuel into the cylinder when the tubular valve is lifted.

5. The combination with a high pressure internal combustion engine, of a valve casing having a seat at its lower end, a passage conveying fluid pressure to said seat, atubular valve cooperating with said seat and having ports through its. walls above the seat, a check valve above said ports, and means for forcing liquid fuel into said tubular valve, past said check valve and out through said ports.

6. The combination with a high pressure internal combustion engine, of a valve casing having a conical seat at its lower end, a tortuous passage in its wall, ducts connecting said passage with said seat, a tubular valve fitting said seat and having ports which register with said ducts when said valve is seated, a downwardly-opening check valve in said tubular valve, and means for forcing liquid fuel through said tubular valve.

7. The combination with a high pressure internal combustion engine, of a valve casing having a conical seat at its lower end, a tortuous passage in its wall, ducts connecting said passage with said seat, a tubular valve fitting said seat and having ports which register with said ducts when said valve is seated, a downwardly-opening check Valve in said tubular valve, and'means for forcing liquid fuel through said tubular valve, said means comprising a pump having-a check valve in its delivery pipe.

8. The combination with a high ressure internal combustion engine, of a v: ve casing having-a seat at its lower end, a tortuous passage in its wall, ducts connecting said passage with said seat, a tubular valve fitting said seat and having ports communicating with said ducts, a downwardly opening check valve in said tubular valve, .a pump having a check valve on its delivery side, and a flexible pipe connecting said pump with said tubular valve,

witness whereof, I have'hereunto set my hand this-19th day of July, 1913.

' i FRANZ MULLER. Witnesses: 5

G. Hi'JLBRooK,

F. Zmcann. 

